Re: [R] Getting the numeric value of difftime

From: Barry Rowlingson <B.Rowlingson_at_lancaster.ac.uk>
Date: Sat 14 Jan 2006 - 00:16:21 EST

Christian Neumann wrote:
> Hi folks,
>
> I have a small, maybe newbie, question concerning date operations.
> The follwing snippet
>
> date1 = "2005-11-20";
> date2 = "2005-11-17";
> difftime(date1, date2)
>
> results in "Time difference of 3 days". How can I extract just the
> numerical value 3?
> As a workaround I apply mean() on the result which gives me just a
> numerical value.

  If you want to get one thing _as_ another the R-ish solution is nearly always to do as.another(oneThing).

  You want it numeric? You got it!

 > date1 = "2005-11-20";
 > date2 = "2005-11-17";
 > difftime(date1, date2)

Time difference of 3 days
 > as.numeric(difftime(date1, date2))
[1] 3

Barry



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